Actually I wrote there are in fact
no odds to play when running CC kit (it was Fenceline that mentioned "if I were to play the odds"... if only in jest I think) and I would say the same for HK as well (with regard to the MR223 you speak of or any of HK's products just like CC, both these companies are at the pinnacle of military small arms design...).
Because I believe these companies produce superior quality firearms/systems parts and like anything they produce, nothing leaves the factory w/o being thoroughly tested and proven.
By that I mean nothing is offered w/o being throughly tested to a standard that goes well beyond what 99.99% of CGN shooters will put a restricted rifle through in Canada.
Also (IMO) it's fair to say that CC doesn't offer anything that isn't better then mil-spec. (as CC has made over 100 hundred improvements over USA mil-spec which many would consider the basic standard to judge from) and (IMO) believe their semi. BCG's are to that same standard and quality as the F/A BCG's.
I say this knowing that our LEO's are putting their lives on the line running these very same semi. BCG's that come on the CC SA rifles in their issued CC rifles; so I highly doubt CC would cut corners in either their development or design/testing (and HK likely is the same with any of their civilian/LEO products).
BTW congrats on the SA20 prize, must have been an exciting moment and with your IUR purchase you know have a very sweet set-up.
Cheers D